AF monitoring and stroke: XPECT & REVEAL LINQ Helmut Pürerfellner, Linz, Austria
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Medtronic Confidential 3
Circ Arrhythm Electrophysiol 2010;3:141-47
Reveal XT versus LINQ 5 Parameter Reveal XT Reveal LINQ TM Longevity 3 years 3 years Electrode Spacing (inside-to-inside) 41 mm 38 mm Volume 9 cc 1.18 cc Mass 15 g ~2.5 g Episode Storage 49 min 57 min Patient Symptom Mark Patient Assistant Patient Assistant Cardiac Compass Same Same MRI Compatibility MR Conditional MR Conditional Clinician Notification No Nightly Transmission / CareAlerts Bi-Directional Telemetry B B Detection Algorithms Full View Full View + P-wave detection CareLink Yes Yes New CL Full reports, online episode viewer, online trends viewer, episode rollup since implant, 31-day summary report, CareAlert event reports, FullView zoom capability Wireless Telemetry No 1-Way, Transmit Only Medtronic Confidential. Do Not Copy Or Distribute Investigational Use Only
XPECT
XPECT
Causes for Inappropriate AF Detection Over-sensing due to noise Bigeminy and trigeminy Frequent ectopy with irregular coupling interval Sick sinus: brady-tachy syndrome Sinus tachycardia with RR variability Under-sensing due to small amplitude or wide R-waves T-wave over-sensing or p-waves oversensing
Goal for AF detection in Reveal LinQ Reduce episode review burden Algorithm enhancements in Reveal LinQ Nominal programming based on patient type Enhanced episode storage scheme Preserve AF burden accuracy Preserve Sensitivity to AF detection 10
P-SENSE: P-wave Averaging Rate/ Irregularity criteria 1 2 3 4 Average 4 Baseline ECG 11 Medtronic Confidential. Internal Use Only.
P-SENSE: P-wave feature extraction Morphology of Averaged ECG is used to identify Presence of P-wave Absence of atrial flutter waves Absence of baseline noise P-wave Flutter Noise Medtronic Confidential. Internal Use Only. 12
P-SENSE: Modify AF evidence Reveal ECG R-wave sensing R-wave sense R-R intervals RR interval based AF detection AF evidence score + - Modified AF evidence score Compare AF detection result P-wave feature extraction P-wave features P-wave evidence algorithm P-wave evidence score Threshold Ectopy Rejection: Off Nominal Aggressive Threshold: More Sensitive Balanced Sensitivity Less Sensitive Least Sensitive
AF detection in Reveal LinQ: Programming options 14
Optimizing AF Detection for Patient Type Reduce burden of episode review Reason for Monitoring Parameters AF Detection Threshold Ectopy Rejection Episode Storage Threshold Syncope Least Aggressive Longest Episode Only Seizures Least Aggressive 10 min Ventricular Tachycardia Least Aggressive 10 min Palpitations Less Aggressive 6 min Suspected AF Less Aggressive 6 min Cryptogenic Stroke Balanced Aggressive All AF Ablation Balanced Nominal All AF Management Balanced Nominal All Other Less Aggressive 10 min AF detection nice to have Does patient have AF? Does patient have AF? How much AF? 15 Medtronic Confidential. Internal Use Only.
Heart Rhythm 2014;11:1575-1583
P-SENSE Performance summary False episodes reduced by 46% with 2% reduction in true episodes False duration reduced by 55% with 0.1% reduction in true duration Detected 97.8% of total AF duration Detected 99.3% of total sinus or non-af rhythm duration Detected 85% (90% patient average) of all AF episodes 2 minutes 55% (78% patient average) of detected episodes had AF 95% of detected episodes >1 hour had AF 14% of patients had false detects 7% of patients with only false detects 3 patients account for 70% of false detects
Reveal XT versus LINQ 19 Parameter Reveal XT Reveal LINQ TM Longevity 3 years 3 years Electrode Spacing (inside-to-inside) 41 mm 38 mm Volume 9 cc 1.18 cc Mass 15 g ~2.5 g Episode Storage 49 min 57 min Patient Symptom Mark Patient Assistant Patient Assistant Cardiac Compass Same Same MRI Compatibility MR Conditional MR Conditional Clinician Notification No Nightly Transmission / CareAlerts Bi-Directional Telemetry B B Detection Algorithms Full View Full View + P-wave detection CareLink Yes Yes New CL Full reports, online episode viewer, online trends viewer, episode rollup since implant, 31-day summary report, CareAlert event reports, FullView zoom capability Wireless Telemetry No 1-Way, Transmit Only Medtronic Confidential. Do Not Copy Or Distribute Investigational Use Only
LINQ TM System Components Medtronic Confidential. Do Not Copy Or Distribute Investigational Use Only 20
Heart Rhythm 2015 (in press)
Insertion Procedure: Insertion Procedure Location: Cath Lab: n=25 (83.3%) Clean Room: n=5 (16.7%) Primary Indication Implanted Subjects (n=30) Syncope 19 (63.3%) Palpitations 3 (10.0%) Seizures 0 (0.0%) Insertion Location: Suspected AF 2 (6.7%) AF Ablation Monitoring 2 (6.7%) 28 (93.3%) 2 (6.7%) AF Management 2 (6.7%) Cryptogenic Stroke 1 (3.3%) Ventricular Tachycardia 0 (0.0%) Other 1 (3.3%) Medtronic Confidential. Do Not Copy Or Distribute
Medtronic Confidential. Do Not Copy Or Distribute Results 100% (n=30) implant success for Phase I Successful transmissions in 79,5% R-wave amplitude 200µV at implant for 96.7% of subjects High physician and patient acceptance No significant migration No reportable system or procedure adverse events **Note: The Reveal LINQ System has received CE Mark and TGA Approval and is Pending FDA 510K Clearance**
Reveal LINQ
AF diagnosis and monitoring: Clinical Applications Secondary stroke prevention (post cryptogenic stroke) Sinha AM et al Am Heart J. 2010;160(1):36-41. Ritter MA et al Stroke. 2013;44(5):1449-52. Etgen T et al. Stroke. 2013;44(7):2007-9. Pre and post PV ablation Pokuslalov E et al. J Cardiovasc Electrophysiol. 2011;22(4):369-75. Verma A et al. JAMA Intern Med. 2013;173(2):149-56. Kapa S et al. J Cardiovasc Electrophysiol. 2013;24(8):875-81. Post surgical AF ablation Hanke T et al. Circulation. 2009;120(11 Suppl):S177-84. Selection of patients for redo ablation Pokushalov E et al. Circ Arrhythm Electrophysiol. 2011;4(6):823-31. Pokushalov E et al. Circ Arrhythm Electrophysiol. 2013;6(4):754-60. Post atrial flutter ablation Mittal S et al Heart Rhythm. 2013. doi: 10.1016/j.hrthm.2013.07.044. Primary stroke prevention (high risk of stroke) Reveal AF study (enrolling) 25